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	基于早期变形特征的混凝土凝结时间的确定
	侯东伟 ; 张君 ; 孙伟 ; HOU Dongwei ; ZHANG Jun ; SUN Wei
	2010-06-07 ; 2010-06-07
关键词	新浇混凝土 凝结时间 膨胀 收缩 fresh concrete setting time swelling shrinkage TU528
其他题名	DETERMINATION OF CONCRETE SETTING TIME BASED ON MEASUREMENTS OF DEFORMATION
中文摘要	通过考察新浇混凝土的凝结硬化过程,研究了普通混凝土与高强混凝土早龄期自由变形随龄期的发展规律,提出了确定混凝土凝结时间的新方法,与贯入阻力法测得的初凝和终凝时间进行了对比,并对混凝土早期变形特征进行了机理分析和讨论。实验结果显示:新浇混凝土具有先膨胀后收缩的变形特征;与混凝土侧压力为零的时刻相对应,可将其膨胀变形结束点定义为混凝土的凝结时间。以混凝土凝结时间为界,根据混凝土变形是否引起混凝土结构产生应力,将混凝土的变形划分为无害变形和有害变形。混凝土凝结之前发生的变形为无害变形,凝结之后发生的变形为有害变形。因此有物理意义的变形起始时间为早龄期膨胀变形的结束点。; A method to determine the setting time of concrete was developed based on measuring the development of deformation with time of very early age concrete. The experimental results show that the global deformation of very early age concrete first exhib- its plastic swelling in the first few hours after casting and then exhibits shrinkage, with a gradually reduced rate. The end of swelling normally corresponds to the point of concrete setting, at which the transformation of fresh concrete from liquid-like plastic state to solid state is complete. The above definition of concrete setting time is well coordinated with the determination method by measuring the lateral stress acting on the form of concrete. According to the definition of concrete setting time proposed in the present work, the deformation of concrete in the early age may be divided into two categories: non deleterious deformation and deleterious deformation. The deformation occurring after the setting point belongs to deleterious deformation, and the deformation occurring before the setting point is non deleterious deformation.; 国家“973”计划(2009CB623200)资助项目
语种	中文 ; 中文
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/47346]
专题	清华大学
推荐引用方式 GB/T 7714	侯东伟,张君,孙伟,等. 基于早期变形特征的混凝土凝结时间的确定[J],2010, 2010.
APA	侯东伟,张君,孙伟,HOU Dongwei,ZHANG Jun,&SUN Wei.(2010).基于早期变形特征的混凝土凝结时间的确定..
MLA	侯东伟,et al."基于早期变形特征的混凝土凝结时间的确定".(2010).

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